2.) Is it possible to have negative velocity but positive acceleration? If so, what would this mean?

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

What is created when solids,liquids,an gases mix with one another

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.